On Tuesday, the 24th of July, Alexander informed Charlton that the telephone lines were ready, and they can proceed with the demonstration in the palace. Charlton wrote his uncle Regulus regarding this matter on the day itself.
He was surprised to receive his response the next day informing him that they should ready themselves on Friday as the king and the members of the house of lords have been looking forward to the demonstration and granted them audience that day.
Thus, on the 27th of July, Charlton and Alexander Bell were standing in the palace grounds waiting to be called inside.
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